3721-ST

Model 3721 Keithley Instruments, Inc. 28775 Aurora Road Cleveland, Ohio 44139 1-888-KEITHLEY www.keithley.com Dual 1x20 Channel Multiplexer Specifications 40 differential channels, automatic CJC w/3721-ST accessory MULTIPLEXER CONFIGURATION: Two independent 1x 20 2-pole Multiplexers. Banks can be connected together via relay creating a single 1 x 40 Multiplexer. Banks can be isolated from the backplane by relays. Card can be configured for common side Ohm measurement via back plane relays. Channel (41-42): Multiplex one of two 2-pole current signals into DMM CONTACT CONFIGURATION: 2 pole form A. CONNECTOR TYPE: Two 50 pin male D-shells. Removable screw terminal option. MAXIMUM SIGNAL LEVEL: Channels (1-40): 300V DC or RMS, 2A switched (3A carry), 60W, 125VA Maximum. Channels (41-42): 60V DC or 30VRMS, 3A switched, 60W, 125VA Maximum. Fused 3A, 250V RMS COMMON MODE VOLTAGE: 300V DC or RMS between any terminal and chassis. Channels (1-40) VOLT-HERTZ LIMIT: 8x107 CONTACT LIFE: > 105 operations at max signal level. > 108 operations no load. 1 Dual 1x20 3 Single 1x40 2, 3 Channel Resistance (end of contact life) < 1.0 Ω < 1.5 Ω Contact Potential (differential) < ± 1 μV < ± 3 μV < ±250 pA < ±250 pA Differential 109Ω, 280pF 109Ω, 530pF Bank-Bank 1011Ω, 60pF -- CH -CH 109Ω, 50pF 109Ω, 50pF Common mode 109Ω,180pF 109Ω, 480pF Crosstalk CH-CH 300KHz: 1MHz: 20MHz: < -60dB < -50dB < -25dB < -60dB < -50dB < -15dB Bandwidth 28 MHz 9 MHz Offset Current Isolation 1 Open detector enabled during thermocouple measurements. Minimum signal level 10mV,10uA 3706 mainframe with all DMM backplane relays disconnected. Maximum two card backplane relays closed. 3 Connections made using 3721-ST accessory 2 Specifications are subject to change without notice. SPEC-3721 Rev. D / February 2009 Page 1 of 4 Model 3721 Keithley Instruments, Inc. 28775 Aurora Road Cleveland, Ohio 44139 (440) 248-0400 www.keithely.com Dual 1x20 Channel Multiplexer Specifications 40 differential channels, automatic CJC w/3721-ST accessory GENERAL: ACTUATION TIME: 4ms TEMPERATURE ACCURACY USING Automatic CJC with 3721-ST accessory: 1ºC for J, K, T and E types (see mainframe specification for details) RELAY TYPE: Latching electromechanical RELAY DRIVE SCHEME: Direct INTERLOCK: Backplane relays are disabled when interlock connection is removed. OPERATING ENVIRONMENT: Specified for 0ºC to 50ºC. Specified to 70% R.H. at 35ºC STORAGE ENVIRONMENT: -25ºC to 65ºC WEIGHT: 2.25 lb SAFETY: Conforms to European Union Directive 73/23/EEC, EN61010-1 EMC: Conforms to European Union Directive 2004/108/EC, EN61326-1 Typical Scanning Speeds, switch only 4 Sequential scanning ,single channel, immediate trigger advance Ch/Sec >120 Typical Scanning Speeds, with measurements into memory 5 DCV (10V range) or 2W Ohms (1KΩ range) Thermocouple 3 or 4 Wire RTD 4 Wire Ohms (1kΩ range) ACV (10V, 400Hz range) or ACI (1A, 400Hz range) 4 5 Ch/Sec >110 >110 >100 >100 >110 Scanning script local to 3706 mainframe, within same bank, and break before make switching. 3706 mainframe with autorange off, limits off, dmm.autozero=0, dmm.autodelay=0, 4½ digits (NPLC=.006), for ACV dmm.detectorbandwidth=300,for OHMs dmm.offsetcompensation=off, dmm.opendetector=off. Scanning script local to mainframe, sequential scan within same bank (2 pole ) or card (4 pole), and break before make switching. Specifications are subject to change without notice. Page 2 of 4 SPEC-3721 Rev. D / February 2009 Model 3721 Keithley Instruments, Inc. 28775 Aurora Road Cleveland, Ohio 44139 1-888-KEITHLEY www.keithley.com Dual 1x20 Channel Multiplexer Specifications 40 differential channels, automatic CJC w/3721-ST accessory ACCESSORIES AVAILABLE: 3790-KIT50R 50 pin female D-sub connector kit (contains 2 female D-sub connectors and 100 solder-cup) 3721-MTC-3 50 pin D-sub female to male cable, 3m 3721-MTC-1.5 50 pin D-sub female to male cable, 1.5m 3721-ST screw terminal block (Required for auto CJC thermocouple measurements) 7401 Type K Thermocouple Wire (100ft) Specifications are subject to change without notice. SPEC-3721 Rev. D / February 2009 Page 3 of 4 Model 3721 Keithley Instruments, Inc. 28775 Aurora Road Cleveland, Ohio 44139 (440) 248-0400 www.keithely.com Dual 1x20 Channel Multiplexer Specifications 40 differential channels, automatic CJC w/3721-ST accessory Specifications are subject to change without notice. Page 4 of 4 SPEC-3721 Rev. D / February 2009